Goldfinch, really? Thanks for the identificataion, now I'll know to watch for them. We switched dog parks in the late fall, so I have only been going to this one over the winter and don't really know all the birds. (I only recognize the most common birds anyway.) I saw another nest, higher up, but it was in tree/bush above my head and the plant had inch long thorns. I'll post a pic if I can find a way to get close without getting shredded.